/* ui-quiz.js — Correspondences quiz */
(function () {
  "use strict";

  const state = {
    initialized: false,
    scoreCorrect: 0,
    scoreAnswered: 0,
    selectedCategory: "random",
    selectedDifficulty: "normal",
    questionBank: [],
    templateByKey: new Map(),
    runUnseenKeys: [],
    runRetryKeys: [],
    runRetrySet: new Set(),
    currentQuestion: null,
    answeredCurrent: false,
    autoAdvanceTimer: null,
    autoAdvanceDelayMs: 1500
  };

  const FIXED_CATEGORY_OPTIONS = [
    { value: "random", label: "Random" },
    { value: "all", label: "All" }
  ];

  const CATEGORY_META = [
    { id: "english-gematria", label: "English Gematria" },
    { id: "hebrew-numerology", label: "Hebrew Gematria" },
    { id: "english-hebrew-mapping", label: "Alphabet Mapping" },
    { id: "zodiac-rulers", label: "Zodiac Rulers" },
    { id: "zodiac-elements", label: "Zodiac Elements" },
    { id: "planetary-weekdays", label: "Planetary Weekdays" },
    { id: "zodiac-tarot", label: "Zodiac ↔ Tarot" },
    { id: "kabbalah-path-between-sephirot", label: "Kabbalah: Path Between Sephirot" },
    { id: "kabbalah-path-letter", label: "Kabbalah: Path Number ↔ Letter" },
    { id: "kabbalah-path-tarot", label: "Kabbalah: Path ↔ Tarot Trump" },
    { id: "sephirot-planets", label: "Sephirot ↔ Planet" },
    { id: "tarot-decan-sign", label: "Tarot Decans: Card ↔ Decan" },
    { id: "tarot-decan-ruler", label: "Tarot Decans: Card ↔ Ruler" },
    { id: "tarot-cube-location", label: "Tarot ↔ Cube Location" },
    { id: "cube-hebrew-letter", label: "Cube ↔ Hebrew Letter" },
    { id: "playing-card-tarot", label: "Playing Card ↔ Tarot" }
  ];

  // Dynamic category plugin registry — populated by registerQuizCategory()
  const DYNAMIC_CATEGORY_REGISTRY = [];

  function registerQuizCategory(id, label, builder) {
    if (typeof id !== "string" || !id || typeof builder !== "function") {
      return;
    }

    const existingIndex = DYNAMIC_CATEGORY_REGISTRY.findIndex((entry) => entry.id === id);
    if (existingIndex >= 0) {
      DYNAMIC_CATEGORY_REGISTRY[existingIndex] = { id, label: String(label || id), builder };
    } else {
      DYNAMIC_CATEGORY_REGISTRY.push({ id, label: String(label || id), builder });
    }

    if (!CATEGORY_META.some((item) => item.id === id)) {
      CATEGORY_META.push({ id, label: String(label || id) });
    }
  }

  let categoryEl;
  let difficultyEl;
  let questionTypeEl;
  let questionEl;
  let optionsEl;
  let feedbackEl;
  let resetEl;
  let scoreCorrectEl;
  let scoreAnsweredEl;
  let scoreAccuracyEl;

  function getElements() {
    categoryEl = document.getElementById("quiz-category");
    difficultyEl = document.getElementById("quiz-difficulty");
    questionTypeEl = document.getElementById("quiz-question-type");
    questionEl = document.getElementById("quiz-question");
    optionsEl = document.getElementById("quiz-options");
    feedbackEl = document.getElementById("quiz-feedback");
    resetEl = document.getElementById("quiz-reset");
    scoreCorrectEl = document.getElementById("quiz-score-correct");
    scoreAnsweredEl = document.getElementById("quiz-score-answered");
    scoreAccuracyEl = document.getElementById("quiz-score-accuracy");
  }

  function isReady() {
    return Boolean(
      categoryEl
      && difficultyEl
      && questionTypeEl
      && questionEl
      && optionsEl
      && feedbackEl
      && resetEl
      && scoreCorrectEl
      && scoreAnsweredEl
      && scoreAccuracyEl
    );
  }

  function clearAutoAdvanceTimer() {
    if (!state.autoAdvanceTimer) {
      return;
    }
    clearTimeout(state.autoAdvanceTimer);
    state.autoAdvanceTimer = null;
  }

  function queueAutoAdvance() {
    clearAutoAdvanceTimer();
    state.autoAdvanceTimer = setTimeout(() => {
      state.autoAdvanceTimer = null;
      showNextQuestion();
    }, state.autoAdvanceDelayMs);
  }

  function toTitleCase(value) {
    const text = String(value || "").trim().toLowerCase();
    if (!text) {
      return "";
    }
    return text.charAt(0).toUpperCase() + text.slice(1);
  }

  function normalizeOption(value) {
    return String(value || "").trim();
  }

  function normalizeKey(value) {
    return normalizeOption(value).toLowerCase();
  }

  function toUniqueOptionList(values) {
    const seen = new Set();
    const unique = [];

    (values || []).forEach((value) => {
      const formatted = normalizeOption(value);
      if (!formatted) {
        return;
      }

      const key = normalizeKey(formatted);
      if (seen.has(key)) {
        return;
      }

      seen.add(key);
      unique.push(formatted);
    });

    return unique;
  }

  function shuffle(list) {
    const clone = list.slice();
    for (let index = clone.length - 1; index > 0; index -= 1) {
      const nextIndex = Math.floor(Math.random() * (index + 1));
      [clone[index], clone[nextIndex]] = [clone[nextIndex], clone[index]];
    }
    return clone;
  }

  function pickMany(list, count) {
    if (!Array.isArray(list) || !list.length || count <= 0) {
      return [];
    }
    return shuffle(list).slice(0, Math.min(count, list.length));
  }

  function getActiveDifficulty() {
    const value = String(state.selectedDifficulty || "normal").toLowerCase();
    if (value === "easy" || value === "hard") {
      return value;
    }
    return "normal";
  }

  function resolveDifficultyValue(valueByDifficulty, difficulty = getActiveDifficulty()) {
    if (valueByDifficulty == null) {
      return "";
    }

    if (typeof valueByDifficulty !== "object" || Array.isArray(valueByDifficulty)) {
      return valueByDifficulty;
    }

    if (Object.prototype.hasOwnProperty.call(valueByDifficulty, difficulty)) {
      return valueByDifficulty[difficulty];
    }

    if (Object.prototype.hasOwnProperty.call(valueByDifficulty, "normal")) {
      return valueByDifficulty.normal;
    }

    if (Object.prototype.hasOwnProperty.call(valueByDifficulty, "easy")) {
      return valueByDifficulty.easy;
    }

    if (Object.prototype.hasOwnProperty.call(valueByDifficulty, "hard")) {
      return valueByDifficulty.hard;
    }

    return "";
  }

  function buildOptions(correctValue, poolValues) {
    const correct = normalizeOption(correctValue);
    if (!correct) {
      return null;
    }

    const uniquePool = toUniqueOptionList(poolValues || []);
    if (!uniquePool.some((value) => normalizeKey(value) === normalizeKey(correct))) {
      uniquePool.push(correct);
    }

    const distractors = uniquePool.filter((value) => normalizeKey(value) !== normalizeKey(correct));
    if (distractors.length < 3) {
      return null;
    }

    const selectedDistractors = pickMany(distractors, 3);
    const options = shuffle([correct, ...selectedDistractors]);
    const correctIndex = options.findIndex((value) => normalizeKey(value) === normalizeKey(correct));

    if (correctIndex < 0 || options.length < 4) {
      return null;
    }

    return {
      options,
      correctIndex
    };
  }

  function createQuestionTemplate(payload, poolValues) {
    const key = String(payload?.key || "").trim();
    const promptByDifficulty = payload?.promptByDifficulty ?? payload?.prompt;
    const answerByDifficulty = payload?.answerByDifficulty ?? payload?.answer;
    const poolByDifficulty = poolValues;
    const categoryId = String(payload?.categoryId || "").trim();
    const category = String(payload?.category || "Correspondence").trim();

    const defaultPrompt = String(resolveDifficultyValue(promptByDifficulty, "normal") || "").trim();
    const defaultAnswer = normalizeOption(resolveDifficultyValue(answerByDifficulty, "normal"));
    const defaultPool = toUniqueOptionList(resolveDifficultyValue(poolByDifficulty, "normal") || []);

    if (!key || !defaultPrompt || !defaultAnswer || !categoryId || !category) {
      return null;
    }

    if (!defaultPool.some((value) => normalizeKey(value) === normalizeKey(defaultAnswer))) {
      defaultPool.push(defaultAnswer);
    }

    const distractorCount = defaultPool.filter((value) => normalizeKey(value) !== normalizeKey(defaultAnswer)).length;
    if (distractorCount < 3) {
      return null;
    }

    return {
      key,
      categoryId,
      category,
      promptByDifficulty,
      answerByDifficulty,
      poolByDifficulty
    };
  }

  function instantiateQuestion(template) {
    if (!template) {
      return null;
    }

    const prompt = String(resolveDifficultyValue(template.promptByDifficulty) || "").trim();
    const answer = normalizeOption(resolveDifficultyValue(template.answerByDifficulty));
    const pool = toUniqueOptionList(resolveDifficultyValue(template.poolByDifficulty) || []);

    if (!prompt || !answer) {
      return null;
    }

    const built = buildOptions(answer, pool);
    if (!built) {
      return null;
    }

    return {
      key: template.key,
      categoryId: template.categoryId,
      category: template.category,
      prompt,
      answer,
      options: built.options,
      correctIndex: built.correctIndex
    };
  }

  function buildQuestionBank(referenceData, magickDataset) {
    const grouped = magickDataset?.grouped || {};
    const alphabets = grouped.alphabets || {};
    const englishLetters = Array.isArray(alphabets?.english) ? alphabets.english : [];
    const hebrewLetters = Array.isArray(alphabets?.hebrew) ? alphabets.hebrew : [];
    const kabbalahTree = grouped?.kabbalah?.["kabbalah-tree"] || {};
    const treePaths = Array.isArray(kabbalahTree?.paths) ? kabbalahTree.paths : [];
    const treeSephiroth = Array.isArray(kabbalahTree?.sephiroth) ? kabbalahTree.sephiroth : [];
    const sephirotById = grouped?.kabbalah?.sephirot && typeof grouped.kabbalah.sephirot === "object"
      ? grouped.kabbalah.sephirot
      : {};
    const cube = grouped?.kabbalah?.cube && typeof grouped.kabbalah.cube === "object"
      ? grouped.kabbalah.cube
      : {};
    const cubeWalls = Array.isArray(cube?.walls) ? cube.walls : [];
    const cubeEdges = Array.isArray(cube?.edges) ? cube.edges : [];
    const cubeCenter = cube?.center && typeof cube.center === "object" ? cube.center : null;
    const playingCardsData = grouped?.["playing-cards-52"];
    const playingCards = Array.isArray(playingCardsData)
      ? playingCardsData
      : (Array.isArray(playingCardsData?.entries) ? playingCardsData.entries : []);
    const signs = Array.isArray(referenceData?.signs) ? referenceData.signs : [];
    const planetsById = referenceData?.planets && typeof referenceData.planets === "object"
      ? referenceData.planets
      : {};
    const planets = Object.values(planetsById);
    const decansBySign = referenceData?.decansBySign && typeof referenceData.decansBySign === "object"
      ? referenceData.decansBySign
      : {};

    const normalizeId = (value) => String(value || "").trim().toLowerCase();

    const toRomanNumeral = (value) => {
      const numeric = Number(value);
      if (!Number.isFinite(numeric) || numeric <= 0) {
        return String(value || "");
      }

      const intValue = Math.trunc(numeric);
      const lookup = [
        [1000, "M"],
        [900, "CM"],
        [500, "D"],
        [400, "CD"],
        [100, "C"],
        [90, "XC"],
        [50, "L"],
        [40, "XL"],
        [10, "X"],
        [9, "IX"],
        [5, "V"],
        [4, "IV"],
        [1, "I"]
      ];

      let current = intValue;
      let result = "";
      lookup.forEach(([size, symbol]) => {
        while (current >= size) {
          result += symbol;
          current -= size;
        }
      });

      return result || String(intValue);
    };

    const labelFromId = (value) => {
      const id = String(value || "").trim();
      if (!id) {
        return "";
      }
      return id
        .replace(/[_-]+/g, " ")
        .replace(/\s+/g, " ")
        .trim()
        .split(" ")
        .map((part) => part ? part.charAt(0).toUpperCase() + part.slice(1) : "")
        .join(" ");
    };

    const getPlanetLabelById = (planetId) => {
      const normalized = normalizeId(planetId);
      if (!normalized) {
        return "";
      }

      const directPlanet = planetsById[normalized];
      if (directPlanet?.name) {
        return directPlanet.name;
      }

      if (normalized === "primum-mobile") {
        return "Primum Mobile";
      }
      if (normalized === "olam-yesodot") {
        return "Earth / Elements";
      }

      return labelFromId(normalized);
    };

    const hebrewById = new Map(
      hebrewLetters
        .filter((entry) => entry?.hebrewLetterId)
        .map((entry) => [normalizeId(entry.hebrewLetterId), entry])
    );

    const formatHebrewLetterLabel = (entry, fallbackId = "") => {
      if (entry?.name && entry?.char) {
        return `${entry.name} (${entry.char})`;
      }
      if (entry?.name) {
        return entry.name;
      }
      if (entry?.char) {
        return entry.char;
      }
      return labelFromId(fallbackId);
    };

    const sephiraNameByNumber = new Map(
      treeSephiroth
        .filter((entry) => Number.isFinite(Number(entry?.number)) && entry?.name)
        .map((entry) => [Math.trunc(Number(entry.number)), String(entry.name)])
    );

    const sephiraNameById = new Map(
      treeSephiroth
        .filter((entry) => entry?.sephiraId && entry?.name)
        .map((entry) => [normalizeId(entry.sephiraId), String(entry.name)])
    );

    const getSephiraName = (numberValue, idValue) => {
      const numberKey = Number(numberValue);
      if (Number.isFinite(numberKey)) {
        const byNumber = sephiraNameByNumber.get(Math.trunc(numberKey));
        if (byNumber) {
          return byNumber;
        }
      }

      const byId = sephiraNameById.get(normalizeId(idValue));
      if (byId) {
        return byId;
      }

      if (Number.isFinite(numberKey)) {
        return `Sephira ${Math.trunc(numberKey)}`;
      }

      return labelFromId(idValue);
    };

    const formatPathLetter = (path) => {
      const transliteration = String(path?.hebrewLetter?.transliteration || "").trim();
      const glyph = String(path?.hebrewLetter?.char || "").trim();

      if (transliteration && glyph) {
        return `${transliteration} (${glyph})`;
      }
      if (transliteration) {
        return transliteration;
      }
      if (glyph) {
        return glyph;
      }
      return "";
    };

    const flattenDecans = Object.values(decansBySign)
      .flatMap((entries) => (Array.isArray(entries) ? entries : []));

    const signNameById = new Map(
      signs
        .filter((entry) => entry?.id && entry?.name)
        .map((entry) => [normalizeId(entry.id), String(entry.name)])
    );

    const formatDecanLabel = (decan) => {
      const signName = signNameById.get(normalizeId(decan?.signId)) || labelFromId(decan?.signId);
      const index = Number(decan?.index);
      if (!signName || !Number.isFinite(index)) {
        return "";
      }
      return `${signName} Decan ${toRomanNumeral(index)}`;
    };

    const bank = [];

    const englishGematriaPool = englishLetters
      .map((item) => (Number.isFinite(Number(item?.pythagorean)) ? String(item.pythagorean) : ""))
      .filter(Boolean);

    const hebrewNumerologyPool = hebrewLetters
      .map((item) => (Number.isFinite(Number(item?.numerology)) ? String(item.numerology) : ""))
      .filter(Boolean);

    const hebrewNameAndCharPool = hebrewLetters
      .filter((item) => item?.name && item?.char)
      .map((item) => `${item.name} (${item.char})`);

    const hebrewCharPool = hebrewLetters
      .map((item) => item?.char)
      .filter(Boolean);

    const planetNamePool = planets
      .map((planet) => planet?.name)
      .filter(Boolean);

    const planetWeekdayPool = planets
      .map((planet) => planet?.weekday)
      .filter(Boolean);

    const zodiacElementPool = signs
      .map((sign) => toTitleCase(sign?.element))
      .filter(Boolean);

    const zodiacTarotPool = signs
      .map((sign) => sign?.tarot?.majorArcana)
      .filter(Boolean);

    const pathNumberPool = toUniqueOptionList(
      treePaths
        .map((path) => {
          const pathNo = Number(path?.pathNumber);
          return Number.isFinite(pathNo) ? String(Math.trunc(pathNo)) : "";
        })
    );

    const pathLetterPool = toUniqueOptionList(treePaths.map((path) => formatPathLetter(path)));
    const pathTarotPool = toUniqueOptionList(treePaths.map((path) => normalizeOption(path?.tarot?.card)));

    const decanLabelPool = toUniqueOptionList(flattenDecans.map((decan) => formatDecanLabel(decan)));
    const decanRulerPool = toUniqueOptionList(
      flattenDecans.map((decan) => getPlanetLabelById(decan?.rulerPlanetId))
    );

    const cubeWallLabelPool = toUniqueOptionList(
      cubeWalls.map((wall) => `${String(wall?.name || labelFromId(wall?.id)).trim()} Wall`)
    );

    const cubeEdgeLabelPool = toUniqueOptionList(
      cubeEdges.map((edge) => `${String(edge?.name || labelFromId(edge?.id)).trim()} Edge`)
    );

    const cubeLocationPool = toUniqueOptionList([
      ...cubeWallLabelPool,
      ...cubeEdgeLabelPool,
      "Center"
    ]);

    const cubeHebrewLetterPool = toUniqueOptionList([
      ...cubeWalls.map((wall) => {
        const hebrew = hebrewById.get(normalizeId(wall?.hebrewLetterId));
        return formatHebrewLetterLabel(hebrew, wall?.hebrewLetterId);
      }),
      ...cubeEdges.map((edge) => {
        const hebrew = hebrewById.get(normalizeId(edge?.hebrewLetterId));
        return formatHebrewLetterLabel(hebrew, edge?.hebrewLetterId);
      }),
      formatHebrewLetterLabel(hebrewById.get(normalizeId(cubeCenter?.hebrewLetterId)), cubeCenter?.hebrewLetterId)
    ]);

    const playingTarotPool = toUniqueOptionList(
      playingCards.map((entry) => normalizeOption(entry?.tarotCard))
    );

    englishLetters.forEach((entry) => {
      if (!entry?.letter || !Number.isFinite(Number(entry?.pythagorean))) {
        return;
      }

      const template = createQuestionTemplate(
        {
          key: `english-gematria:${entry.letter}`,
          categoryId: "english-gematria",
          category: "English Gematria",
          promptByDifficulty: `${entry.letter} has a simple gematria value of`,
          answerByDifficulty: String(entry.pythagorean)
        },
        englishGematriaPool
      );

      if (template) {
        bank.push(template);
      }
    });

    hebrewLetters.forEach((entry) => {
      if (!entry?.name || !entry?.char || !Number.isFinite(Number(entry?.numerology))) {
        return;
      }

      const template = createQuestionTemplate(
        {
          key: `hebrew-number:${entry.hebrewLetterId || entry.name}`,
          categoryId: "hebrew-numerology",
          category: "Hebrew Gematria",
          promptByDifficulty: {
            easy: `${entry.name} (${entry.char}) has a gematria value of`,
            normal: `${entry.name} (${entry.char}) has a gematria value of`,
            hard: `${entry.char} has a gematria value of`
          },
          answerByDifficulty: String(entry.numerology)
        },
        hebrewNumerologyPool
      );

      if (template) {
        bank.push(template);
      }
    });

    englishLetters.forEach((entry) => {
      if (!entry?.letter || !entry?.hebrewLetterId) {
        return;
      }

      const mappedHebrew = hebrewById.get(String(entry.hebrewLetterId));
      if (!mappedHebrew?.name || !mappedHebrew?.char) {
        return;
      }

      const template = createQuestionTemplate(
        {
          key: `english-hebrew:${entry.letter}`,
          categoryId: "english-hebrew-mapping",
          category: "Alphabet Mapping",
          promptByDifficulty: {
            easy: `${entry.letter} maps to which Hebrew letter`,
            normal: `${entry.letter} maps to which Hebrew letter`,
            hard: `${entry.letter} maps to which Hebrew glyph`
          },
          answerByDifficulty: {
            easy: `${mappedHebrew.name} (${mappedHebrew.char})`,
            normal: `${mappedHebrew.name} (${mappedHebrew.char})`,
            hard: mappedHebrew.char
          }
        },
        {
          easy: hebrewNameAndCharPool,
          normal: hebrewNameAndCharPool,
          hard: hebrewCharPool
        }
      );

      if (template) {
        bank.push(template);
      }
    });

    signs.forEach((entry) => {
      if (!entry?.name || !entry?.rulingPlanetId) {
        return;
      }

      const rulerName = planetsById[String(entry.rulingPlanetId)]?.name;
      if (!rulerName) {
        return;
      }

      const template = createQuestionTemplate(
        {
          key: `zodiac-ruler:${entry.id || entry.name}`,
          categoryId: "zodiac-rulers",
          category: "Zodiac Rulers",
          promptByDifficulty: `${entry.name} is ruled by`,
          answerByDifficulty: rulerName
        },
        planetNamePool
      );

      if (template) {
        bank.push(template);
      }
    });

    signs.forEach((entry) => {
      if (!entry?.name || !entry?.element) {
        return;
      }

      const template = createQuestionTemplate(
        {
          key: `zodiac-element:${entry.id || entry.name}`,
          categoryId: "zodiac-elements",
          category: "Zodiac Elements",
          promptByDifficulty: `${entry.name} is`,
          answerByDifficulty: toTitleCase(entry.element)
        },
        zodiacElementPool
      );

      if (template) {
        bank.push(template);
      }
    });

    planets.forEach((entry) => {
      if (!entry?.name || !entry?.weekday) {
        return;
      }

      const template = createQuestionTemplate(
        {
          key: `planet-weekday:${entry.id || entry.name}`,
          categoryId: "planetary-weekdays",
          category: "Planetary Weekdays",
          promptByDifficulty: `${entry.name} corresponds to`,
          answerByDifficulty: entry.weekday
        },
        planetWeekdayPool
      );

      if (template) {
        bank.push(template);
      }
    });

    signs.forEach((entry) => {
      if (!entry?.name || !entry?.tarot?.majorArcana) {
        return;
      }

      const template = createQuestionTemplate(
        {
          key: `zodiac-tarot:${entry.id || entry.name}`,
          categoryId: "zodiac-tarot",
          category: "Zodiac ↔ Tarot",
          promptByDifficulty: `${entry.name} corresponds to`,
          answerByDifficulty: entry.tarot.majorArcana
        },
        zodiacTarotPool
      );

      if (template) {
        bank.push(template);
      }
    });

    treePaths.forEach((path) => {
      const pathNo = Number(path?.pathNumber);
      if (!Number.isFinite(pathNo)) {
        return;
      }

      const pathNumberLabel = String(Math.trunc(pathNo));
      const fromNo = Number(path?.connects?.from);
      const toNo = Number(path?.connects?.to);
      const fromName = getSephiraName(fromNo, path?.connectIds?.from);
      const toName = getSephiraName(toNo, path?.connectIds?.to);
      const pathLetter = formatPathLetter(path);
      const tarotCard = normalizeOption(path?.tarot?.card);

      if (fromName && toName) {
        const template = createQuestionTemplate(
          {
            key: `kabbalah-path-between:${pathNumberLabel}`,
            categoryId: "kabbalah-path-between-sephirot",
            category: "Kabbalah Paths",
            promptByDifficulty: {
              easy: `Which path is between ${fromName} and ${toName}`,
              normal: `What path connects ${fromName} and ${toName}`,
              hard: `${fromName} ↔ ${toName} is which path`
            },
            answerByDifficulty: pathNumberLabel
          },
          pathNumberPool
        );

        if (template) {
          bank.push(template);
        }
      }

      if (pathLetter) {
        const numberToLetterTemplate = createQuestionTemplate(
          {
            key: `kabbalah-path-letter:${pathNumberLabel}`,
            categoryId: "kabbalah-path-letter",
            category: "Kabbalah Paths",
            promptByDifficulty: {
              easy: `Which letter is on Path ${pathNumberLabel}`,
              normal: `Path ${pathNumberLabel} carries which Hebrew letter`,
              hard: `Letter on Path ${pathNumberLabel}`
            },
            answerByDifficulty: pathLetter
          },
          pathLetterPool
        );

        if (numberToLetterTemplate) {
          bank.push(numberToLetterTemplate);
        }

        const letterToNumberTemplate = createQuestionTemplate(
          {
            key: `kabbalah-letter-path-number:${pathNumberLabel}`,
            categoryId: "kabbalah-path-letter",
            category: "Kabbalah Paths",
            promptByDifficulty: {
              easy: `${pathLetter} belongs to which path`,
              normal: `${pathLetter} corresponds to Path`,
              hard: `${pathLetter} is on Path`
            },
            answerByDifficulty: pathNumberLabel
          },
          pathNumberPool
        );

        if (letterToNumberTemplate) {
          bank.push(letterToNumberTemplate);
        }
      }

      if (tarotCard) {
        const pathToTarotTemplate = createQuestionTemplate(
          {
            key: `kabbalah-path-tarot:${pathNumberLabel}`,
            categoryId: "kabbalah-path-tarot",
            category: "Kabbalah ↔ Tarot",
            promptByDifficulty: {
              easy: `Path ${pathNumberLabel} corresponds to which Tarot trump`,
              normal: `Which Tarot trump is on Path ${pathNumberLabel}`,
              hard: `Tarot trump on Path ${pathNumberLabel}`
            },
            answerByDifficulty: tarotCard
          },
          pathTarotPool
        );

        if (pathToTarotTemplate) {
          bank.push(pathToTarotTemplate);
        }

        const tarotToPathTemplate = createQuestionTemplate(
          {
            key: `tarot-trump-path:${pathNumberLabel}`,
            categoryId: "kabbalah-path-tarot",
            category: "Tarot ↔ Kabbalah",
            promptByDifficulty: {
              easy: `${tarotCard} is on which path`,
              normal: `Which path corresponds to ${tarotCard}`,
              hard: `${tarotCard} corresponds to Path`
            },
            answerByDifficulty: pathNumberLabel
          },
          pathNumberPool
        );

        if (tarotToPathTemplate) {
          bank.push(tarotToPathTemplate);
        }
      }
    });

    Object.values(sephirotById).forEach((sephira) => {
      const sephiraName = String(sephira?.name?.roman || sephira?.name?.en || "").trim();
      const planetLabel = getPlanetLabelById(sephira?.planetId);
      if (!sephiraName || !planetLabel) {
        return;
      }

      const template = createQuestionTemplate(
        {
          key: `sephirot-planet:${normalizeId(sephira?.id || sephiraName)}`,
          categoryId: "sephirot-planets",
          category: "Sephirot ↔ Planet",
          promptByDifficulty: {
            easy: `${sephiraName} corresponds to which planet`,
            normal: `Planetary correspondence of ${sephiraName}`,
            hard: `${sephiraName} corresponds to`
          },
          answerByDifficulty: planetLabel
        },
        toUniqueOptionList(Object.values(sephirotById).map((entry) => getPlanetLabelById(entry?.planetId)))
      );

      if (template) {
        bank.push(template);
      }
    });

    flattenDecans.forEach((decan) => {
      const decanId = String(decan?.id || "").trim();
      const card = normalizeOption(decan?.tarotMinorArcana);
      const decanLabel = formatDecanLabel(decan);
      const rulerLabel = getPlanetLabelById(decan?.rulerPlanetId);

      if (!decanId || !card) {
        return;
      }

      if (decanLabel) {
        const template = createQuestionTemplate(
          {
            key: `tarot-decan-sign:${decanId}`,
            categoryId: "tarot-decan-sign",
            category: "Tarot Decans",
            promptByDifficulty: {
              easy: `${card} belongs to which decan`,
              normal: `Which decan contains ${card}`,
              hard: `${card} is in`
            },
            answerByDifficulty: decanLabel
          },
          decanLabelPool
        );

        if (template) {
          bank.push(template);
        }
      }

      if (rulerLabel) {
        const template = createQuestionTemplate(
          {
            key: `tarot-decan-ruler:${decanId}`,
            categoryId: "tarot-decan-ruler",
            category: "Tarot Decans",
            promptByDifficulty: {
              easy: `The decan of ${card} is ruled by`,
              normal: `Who rules the decan for ${card}`,
              hard: `${card} decan ruler`
            },
            answerByDifficulty: rulerLabel
          },
          decanRulerPool
        );

        if (template) {
          bank.push(template);
        }
      }
    });

    cubeWalls.forEach((wall) => {
      const wallName = String(wall?.name || labelFromId(wall?.id)).trim();
      const wallLabel = wallName ? `${wallName} Wall` : "";
      const tarotCard = normalizeOption(wall?.associations?.tarotCard);
      const hebrew = hebrewById.get(normalizeId(wall?.hebrewLetterId));
      const hebrewLabel = formatHebrewLetterLabel(hebrew, wall?.hebrewLetterId);

      if (tarotCard && wallLabel) {
        const template = createQuestionTemplate(
          {
            key: `tarot-cube-wall:${normalizeId(wall?.id || wallName)}`,
            categoryId: "tarot-cube-location",
            category: "Tarot ↔ Cube",
            promptByDifficulty: {
              easy: `${tarotCard} is on which Cube wall`,
              normal: `Where is ${tarotCard} on the Cube`,
              hard: `${tarotCard} location on Cube`
            },
            answerByDifficulty: wallLabel
          },
          cubeLocationPool
        );

        if (template) {
          bank.push(template);
        }
      }

      if (wallLabel && hebrewLabel) {
        const template = createQuestionTemplate(
          {
            key: `cube-wall-letter:${normalizeId(wall?.id || wallName)}`,
            categoryId: "cube-hebrew-letter",
            category: "Cube ↔ Hebrew",
            promptByDifficulty: {
              easy: `${wallLabel} corresponds to which Hebrew letter`,
              normal: `Which Hebrew letter is on ${wallLabel}`,
              hard: `${wallLabel} letter`
            },
            answerByDifficulty: hebrewLabel
          },
          cubeHebrewLetterPool
        );

        if (template) {
          bank.push(template);
        }
      }
    });

    cubeEdges.forEach((edge) => {
      const edgeName = String(edge?.name || labelFromId(edge?.id)).trim();
      const edgeLabel = edgeName ? `${edgeName} Edge` : "";
      const hebrew = hebrewById.get(normalizeId(edge?.hebrewLetterId));
      const hebrewLabel = formatHebrewLetterLabel(hebrew, edge?.hebrewLetterId);
      const tarotCard = normalizeOption(hebrew?.tarot?.card);

      if (tarotCard && edgeLabel) {
        const template = createQuestionTemplate(
          {
            key: `tarot-cube-edge:${normalizeId(edge?.id || edgeName)}`,
            categoryId: "tarot-cube-location",
            category: "Tarot ↔ Cube",
            promptByDifficulty: {
              easy: `${tarotCard} is on which Cube edge`,
              normal: `Where is ${tarotCard} on the Cube edges`,
              hard: `${tarotCard} edge location`
            },
            answerByDifficulty: edgeLabel
          },
          cubeLocationPool
        );

        if (template) {
          bank.push(template);
        }
      }

      if (edgeLabel && hebrewLabel) {
        const template = createQuestionTemplate(
          {
            key: `cube-edge-letter:${normalizeId(edge?.id || edgeName)}`,
            categoryId: "cube-hebrew-letter",
            category: "Cube ↔ Hebrew",
            promptByDifficulty: {
              easy: `${edgeLabel} corresponds to which Hebrew letter`,
              normal: `Which Hebrew letter is on ${edgeLabel}`,
              hard: `${edgeLabel} letter`
            },
            answerByDifficulty: hebrewLabel
          },
          cubeHebrewLetterPool
        );

        if (template) {
          bank.push(template);
        }
      }
    });

    if (cubeCenter) {
      const centerTarot = normalizeOption(cubeCenter?.associations?.tarotCard || cubeCenter?.tarotCard);
      const centerHebrew = hebrewById.get(normalizeId(cubeCenter?.hebrewLetterId));
      const centerHebrewLabel = formatHebrewLetterLabel(centerHebrew, cubeCenter?.hebrewLetterId);

      if (centerTarot) {
        const template = createQuestionTemplate(
          {
            key: "tarot-cube-center",
            categoryId: "tarot-cube-location",
            category: "Tarot ↔ Cube",
            promptByDifficulty: {
              easy: `${centerTarot} is located at which Cube position`,
              normal: `Where is ${centerTarot} on the Cube`,
              hard: `${centerTarot} Cube location`
            },
            answerByDifficulty: "Center"
          },
          cubeLocationPool
        );

        if (template) {
          bank.push(template);
        }
      }

      if (centerHebrewLabel) {
        const template = createQuestionTemplate(
          {
            key: "cube-center-letter",
            categoryId: "cube-hebrew-letter",
            category: "Cube ↔ Hebrew",
            promptByDifficulty: {
              easy: "The Cube center corresponds to which Hebrew letter",
              normal: "Which Hebrew letter is at the Cube center",
              hard: "Cube center letter"
            },
            answerByDifficulty: centerHebrewLabel
          },
          cubeHebrewLetterPool
        );

        if (template) {
          bank.push(template);
        }
      }
    }

    playingCards.forEach((entry) => {
      const cardId = String(entry?.id || "").trim();
      const rankLabel = normalizeOption(entry?.rankLabel || entry?.rank);
      const suitLabel = normalizeOption(entry?.suitLabel || labelFromId(entry?.suit));
      const tarotCard = normalizeOption(entry?.tarotCard);

      if (!cardId || !rankLabel || !suitLabel || !tarotCard) {
        return;
      }

      const template = createQuestionTemplate(
        {
          key: `playing-card-tarot:${cardId}`,
          categoryId: "playing-card-tarot",
          category: "Playing Card ↔ Tarot",
          promptByDifficulty: {
            easy: `${rankLabel} of ${suitLabel} maps to which Tarot card`,
            normal: `${rankLabel} of ${suitLabel} corresponds to`,
            hard: `${rankLabel} of ${suitLabel} maps to`
          },
          answerByDifficulty: tarotCard
        },
        playingTarotPool
      );

      if (template) {
        bank.push(template);
      }
    });

    // Dynamic plugin categories
    DYNAMIC_CATEGORY_REGISTRY.forEach(({ builder }) => {
      try {
        const dynamicTemplates = builder(referenceData, magickDataset);
        if (Array.isArray(dynamicTemplates)) {
          dynamicTemplates.forEach((t) => {
            if (t) {
              bank.push(t);
            }
          });
        }
      } catch (_e) {
        // skip broken plugins silently
      }
    });

    return bank;
  }

  function refreshQuestionBank(referenceData, magickDataset) {
    state.questionBank = buildQuestionBank(referenceData, magickDataset);
    state.templateByKey = new Map(state.questionBank.map((template) => [template.key, template]));

    const hasTemplate = (key) => state.templateByKey.has(key);
    state.runUnseenKeys = state.runUnseenKeys.filter(hasTemplate);
    state.runRetryKeys = state.runRetryKeys.filter(hasTemplate);
    state.runRetrySet = new Set(state.runRetryKeys);

    if (state.currentQuestion && !state.templateByKey.has(state.currentQuestion.key)) {
      state.currentQuestion = null;
      state.answeredCurrent = true;
    }
  }

  function getScopedTemplates() {
    if (!state.questionBank.length) {
      return [];
    }

    const mode = state.selectedCategory || "random";
    if (mode === "random" || mode === "all") {
      return state.questionBank.slice();
    }

    return state.questionBank.filter((template) => template.categoryId === mode);
  }

  function getCategoryOptions() {
    const availableCategoryIds = new Set(state.questionBank.map((template) => template.categoryId));
    const dynamic = CATEGORY_META
      .filter((item) => availableCategoryIds.has(item.id))
      .map((item) => ({ value: item.id, label: item.label }));

    return [...FIXED_CATEGORY_OPTIONS, ...dynamic];
  }

  function renderCategoryOptions() {
    if (!categoryEl) {
      return false;
    }

    const options = getCategoryOptions();
    const preservedValue = state.selectedCategory;
    categoryEl.innerHTML = "";

    options.forEach((optionDef) => {
      const option = document.createElement("option");
      option.value = optionDef.value;
      option.textContent = optionDef.label;
      categoryEl.appendChild(option);
    });

    const validValues = new Set(options.map((optionDef) => optionDef.value));
    const nextSelected = validValues.has(preservedValue) ? preservedValue : "random";
    state.selectedCategory = nextSelected;
    categoryEl.value = nextSelected;
    return nextSelected !== preservedValue;
  }

  function syncDifficultyControl() {
    if (!difficultyEl) {
      return;
    }

    const difficulty = getActiveDifficulty();
    state.selectedDifficulty = difficulty;
    difficultyEl.value = difficulty;
  }

  function getRunLabel() {
    const mode = state.selectedCategory || "random";
    if (mode === "random") {
      return "Random";
    }
    if (mode === "all") {
      return "All";
    }
    return CATEGORY_META.find((item) => item.id === mode)?.label || "Category";
  }

  function startRun(resetScore = false) {
    clearAutoAdvanceTimer();

    if (resetScore) {
      state.scoreCorrect = 0;
      state.scoreAnswered = 0;
    }

    const templates = getScopedTemplates();
    const mode = state.selectedCategory || "random";

    if (!templates.length) {
      state.runUnseenKeys = [];
      state.runRetryKeys = [];
      state.runRetrySet = new Set();
      state.currentQuestion = null;
      state.answeredCurrent = true;
      updateScoreboard();
      renderNoQuestionState();
      return;
    }

    let orderedTemplates;
    if (mode === "all") {
      orderedTemplates = templates
        .slice()
        .sort((left, right) => {
          const leftCategory = String(left.category || "");
          const rightCategory = String(right.category || "");
          if (leftCategory === rightCategory) {
            return String(left.key || "").localeCompare(String(right.key || ""));
          }
          return leftCategory.localeCompare(rightCategory);
        });
    } else {
      orderedTemplates = shuffle(templates);
    }

    state.runUnseenKeys = orderedTemplates.map((template) => template.key);
    state.runRetryKeys = [];
    state.runRetrySet = new Set();
    state.currentQuestion = null;
    state.answeredCurrent = true;

    updateScoreboard();
    showNextQuestion();
  }

  function popNextTemplateFromRun() {
    while (state.runUnseenKeys.length) {
      const key = state.runUnseenKeys.shift();
      const template = state.templateByKey.get(key);
      if (template) {
        return template;
      }
    }

    while (state.runRetryKeys.length) {
      const key = state.runRetryKeys.shift();
      state.runRetrySet.delete(key);
      const template = state.templateByKey.get(key);
      if (template) {
        return template;
      }
    }

    return null;
  }

  function renderRunCompleteState() {
    state.currentQuestion = null;
    state.answeredCurrent = true;
    questionTypeEl.textContent = getRunLabel();
    questionEl.textContent = "Run complete. All previously missed questions are now correct.";
    optionsEl.innerHTML = "";
    feedbackEl.textContent = "Change category/difficulty or press Reset Score to start a new run.";
  }

  function updateScoreboard() {
    if (!isReady()) {
      return;
    }

    const answered = state.scoreAnswered;
    const correct = state.scoreCorrect;
    const accuracy = answered > 0
      ? `${Math.round((correct / answered) * 100)}%`
      : "0%";

    scoreCorrectEl.textContent = String(correct);
    scoreAnsweredEl.textContent = String(answered);
    scoreAccuracyEl.textContent = accuracy;
  }

  function renderQuestion(question) {
    if (!isReady()) {
      return;
    }

    state.currentQuestion = question;
    state.answeredCurrent = false;

    questionTypeEl.textContent = question.category;
    questionEl.textContent = question.prompt;
    feedbackEl.textContent = "Choose the best answer.";

    optionsEl.innerHTML = "";
    question.options.forEach((optionText, index) => {
      const button = document.createElement("button");
      button.type = "button";
      button.className = "quiz-option";
      button.textContent = `${String.fromCharCode(65 + index)}. ${optionText}`;
      button.dataset.optionIndex = String(index);
      button.addEventListener("click", () => {
        submitAnswer(index);
      });
      optionsEl.appendChild(button);
    });
  }

  function renderNoQuestionState() {
    if (!isReady()) {
      return;
    }

    state.currentQuestion = null;
    state.answeredCurrent = true;

    questionTypeEl.textContent = getRunLabel();
    questionEl.textContent = "Not enough variation for this category yet.";
    optionsEl.innerHTML = "";
    feedbackEl.textContent = "Try Random/All or switch to another category.";
  }

  function showNextQuestion() {
    clearAutoAdvanceTimer();

    const totalPending = state.runUnseenKeys.length + state.runRetryKeys.length;
    if (totalPending <= 0) {
      if (state.questionBank.length) {
        renderRunCompleteState();
      } else {
        renderNoQuestionState();
      }
      return;
    }

    const maxAttempts = totalPending + 1;
    for (let index = 0; index < maxAttempts; index += 1) {
      const template = popNextTemplateFromRun();
      if (!template) {
        continue;
      }

      const question = instantiateQuestion(template);
      if (question) {
        renderQuestion(question);
        return;
      }
    }

    renderNoQuestionState();
  }

  function submitAnswer(optionIndex) {
    if (!state.currentQuestion || state.answeredCurrent) {
      return;
    }

    state.answeredCurrent = true;
    state.scoreAnswered += 1;

    const isCorrect = optionIndex === state.currentQuestion.correctIndex;
    if (isCorrect) {
      state.scoreCorrect += 1;
    }

    const optionButtons = optionsEl.querySelectorAll(".quiz-option");
    optionButtons.forEach((button, index) => {
      button.disabled = true;
      if (index === state.currentQuestion.correctIndex) {
        button.classList.add("is-correct");
      } else if (index === optionIndex) {
        button.classList.add("is-wrong");
      }
    });

    if (isCorrect) {
      feedbackEl.textContent = "Correct. Next question incoming…";
    } else {
      feedbackEl.textContent = `Not quite. Correct answer: ${state.currentQuestion.answer}. Next question incoming…`;
      const failedKey = state.currentQuestion.key;
      if (!state.runRetrySet.has(failedKey)) {
        state.runRetrySet.add(failedKey);
        state.runRetryKeys.push(failedKey);
      }
    }

    updateScoreboard();
    queueAutoAdvance();
  }

  function bindEvents() {
    if (!isReady()) {
      return;
    }

    categoryEl.addEventListener("change", () => {
      state.selectedCategory = String(categoryEl.value || "random");
      startRun(true);
    });

    difficultyEl.addEventListener("change", () => {
      state.selectedDifficulty = String(difficultyEl.value || "normal").toLowerCase();
      syncDifficultyControl();
      startRun(true);
    });

    resetEl.addEventListener("click", () => {
      startRun(true);
    });
  }

  function ensureQuizSection(referenceData, magickDataset) {
    ensureQuizSection._referenceData = referenceData;
    ensureQuizSection._magickDataset = magickDataset;

    if (!state.initialized) {
      getElements();
      if (!isReady()) {
        return;
      }

      bindEvents();
      state.initialized = true;
      updateScoreboard();
    }

    refreshQuestionBank(referenceData, magickDataset);
    const categoryAdjusted = renderCategoryOptions();
    syncDifficultyControl();

    if (categoryAdjusted) {
      startRun(false);
      return;
    }

    const hasRunPending = state.runUnseenKeys.length > 0 || state.runRetryKeys.length > 0;
    if (!state.currentQuestion && !hasRunPending) {
      startRun(false);
      return;
    }

    if (!state.currentQuestion && hasRunPending) {
      showNextQuestion();
    }

    updateScoreboard();
  }

  window.QuizSectionUi = {
    ensureQuizSection,
    registerQuizCategory
  };
})();